(The characters appearing in the work are all individuals from parallel worlds and have nothing to do with the original work.) In Kivotos in a certain timeline, time and space rifts suddenly appeared between various colleges, and people from various worlds came to this world. After learning the news, Sensei decided to find them first and take them back to his residence to discuss how to let them live like normal people in Kivotos. However, they unexpectedly gained some mysterious power, which seemed to be related to the future disaster. Sensei had no choice but to unite with these outsiders to fight the approaching disaster.
